Improvement in steam-generators



D. ABELL. Steam-Generator.

WITNESfiBS: INVENTOR: 6% MW 3 QM mar 10/ ATTORNEYS.

MFEIERS, PAQTQUTRQGRAPMER, WASHINGTON. D c.

also in section.

UNITED STATES PATENT OFFICE.

DAN'ABELL, or CARSON orrY, NEVADA.

IMPROVEMENT -lN STEAM-GENERATORS.

Specification forming part of Letters Patent No. 221,0 [1, dated October28, 1879 application filed June 12, 1879.

To all whom "it may concern:

Be it known that I, DAN ABELL, of Carson City, in the county of Ormsbyand State of Nevada, have invented a new and Improved Steam-Generator,of which the following is a specification.

The invention consists in combining with a steam-generator feed-waterpipes extending through the fines and projecting through an opening atthe front and a cap for covering the ends, as hereinafter described.

The invention will be more particularly described in connection with theaccompanying drawings, wherein- Figure l is a vertical longitudinalsection of a boiler constructed in accordance with my invention. Fig. 2is a view at the front end, partially in section. Fig. 3 is a rearelevation,

Similar letters of reference indicate corre sponding parts.

The drawings show a horizontal tubular boiler, a, being the main shell,I) the steamdome, c the fire-box, and d the flue-tubes, that dischargeinto a smoke-box, c, at the rear of the boiler. In the water-space ofthe boiler, and between the fine-tubes d, there is fitted a series ofshort vertical tubes, f, which project from below up to near thewater-line, and are open at each end, so that they act to increase thecirculation within the Water-space. The feed-water pipes (marked lg)connect with the pump at the rear of the boiler through the smoke-box,and pass through the fines d from end to end in a continuous coil, thatfinally enters the water-space near the bottom of the smoke-box at g.These pipes g extend across the firebox c and through an opening in theI front of the boiler, where the return bends and the boiler there arecirculation-pipes 70, which are connected with the water-space of theboiler and with the feed-water pipes g, and extend outside the boiler,so that access may be had .to their cocks lfor closing these pipes 70.These pipes kare required for use to maintain a 'circulation in thefeed-water pipes when starting the boiler or when no feed-water is beingsupplied, and thereby prevent the pipes g from burning out. They arebrought into operation by opening the cooks I.

The pipes g will be connected at their ends with the return-bends byscrew-joints, and screw-caps may be provided in the bends for permittingthe pipes to be cleaned.

The construction described will give a rapid generation of steam with asmall amount of fuel, and at the same time facility of access forcleaning and repairs.

By running the feed-water pipes through the flue-tubes and furnace thefeed-water is subjected to temperature greater than that of the steam inthe boilers. By extending the feed-pipes beyond the end of the boilersthe pines maybe cleaned and repaired without interfering with theboiler. By the use of the circulation-pipes kthe feed-pipes arepreserved. I do not limit myself to the special form of boiler shown, asmy improvements are applicable to other forms.

Having thus described my invention, what I claim as new, and desire tosecure by Letters DAN ABELL.

Witnesses:

JOHN EHRHARDT, J. Q. A. Moonn.

